直接写得数.12÷4= 0.9÷0.001= 12﹣7.2﹣2.8= 1.25×0.8×0.5=2.56﹣1.37= (1.25+0.36)×0.2= 5.4﹣2.5﹣1.4= 4.2÷0.01=1.25×9.2×0.8= 6.6÷2.2= 0.43+1.7+3.3= 7.5×2.5×4=
199×99+99.
计算下列各题.(能简算的要简算)×21× ×+× (+)×24lOO× (﹣)×4×5 ×l01﹣.
用你喜欢的方法计算.(1)2.67+5.04+1.96(2)0.802+5.33+0.198﹣2.33(3)7.49﹣(0.56+2.49)(4)21.43﹣2.17﹣7.83+8.57.
简便运算(1)(25+32)×4 (2)725+308+275+682 (3)125×9×16(4)83×102 (5)25×(13×24)(6)76×176﹣76×76﹣76.
58×52+58×50﹣58×2.